Single-photon detectors based on ultra-narrow superconducting nanowires
| Autor: | Marsili, F., Najafi, F., Dauler, E., Bellei, F., Hu, X., Csete, M. C., Molnar, R., Berggren, K. K. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/nl2005143 |
| Popis: | Superconducting nanowire single-photon detectors (SNSPDs) perform single-photon counting with exceptional sensitivity and time resolution at near-infrared wavelengths. State-of-the-art SNSPDs, based on 100 nm-wide, 4 to 5 nm thick NbN nanowires, are vulnerable to constrictions, which significantly limit their yield. Also, their sensitivity becomes negligible beyond 2 \mu m wavelength, which makes them unsuitable for mid-infrared applications. SNSPDs based on few-tens-of-nanometer-wide nanowires are expected to efficiently detect mid-infrared photons and to operate at low bias currents, so constrictions may have less impact on their performance. Prior to this work, SNSPDs based on nanowires narrower than 50-nm had not been demonstrated because: (1) the SNSPD signal is roughly proportional to the nanowire width, so narrow nanowires have poor signal-to-noise ratio; and (2) fabrication at these length scales is extremely challenging. In this letter we report how we addressed these issues and demonstrated single-photon detection (20% detection efficiency at 1550 nm wavelength) with 30- and 20-nm-wide-nanowire detectors. Comment: This article has been withdrawn to comply to the editorial policy on prior publication of a journal |
| Databáze: | arXiv |
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